No of course not.What insurance companies need to know are any modifications that increase the vehicles performance, increase the vehicles value and increase the likely hood of the vehicle being stolen.

Your 600 quid Corsa is not very attractive to thieves, put a 2 grand stereo set up in it or a set of 800 quid Alloys then it becomes more attractive to the low life mob and increases' the insurers risk.Lower the suspension by 30 or 40mm and you change the makers carefully designed handling package and thus increase the insurers risk.etc etc

For insurance purposes a modification is something which changes the performance or value of a car.

Adding stickers does not make the car go faster, does not make it less save, and does not raise its value.

Usually they reduce the second-hand value of the car because buyers prefer their cars not be cluttered with labels and other stuff which don't appeal to their sense of aesthetics or damage the paint when they're peeled off.